<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .ht {
            text-align: center;
            color: cadetblue;
            font-family: 幼圆;
        }

        .tab {
            width: 500px;
            border: 5px solid cadetblue;
            margin: 0px auto;
            border-radius: 5px;
            font-family: 幼圆;
        }

        .ltr td {
            border: 1px solid powderblue;

        }

        .ipt {
            border: 0px;
            width: 50%;

        }

        .btn1 {
            border: 2px solid powderblue;
            border-radius: 4px;
            width: 60px;
            background-color: antiquewhite;

        }

        .msg {
            color: red;
        }

        .buttonContainer {
            text-align: center;
        }
    </style>

    <script>
        // 检查用户名格式
        function checkUsername() {
            var usernameReg = /^[a-zA-Z0-9]{5,10}$/
            var usernameInput = document.getElementById("usernameInput")
            var username = usernameInput.value
            var usernameMsg = document.getElementById("usernameMsg")
            if (!usernameReg.test(username)) {
                usernameMsg.innerText = "格式有误"
                return false
            }
            usernameMsg.innerText = "OK"
            return true
        }


        function checkForm() {
            var flag1 = checkUsername()
            var flag2 = checkUserPwd()
            var flag3 = checkReUserPwd()

            return flag1 && flag2 && flag3
        }
    </script>

</head>

<body>
    <h1 class="ht">欢迎使用日程管理系统</h1>
    <h3 class="ht">请注册</h3>
    <form method="post" action="/user/regist" onsubmit="return checkForm()">
        <table class="tab" cellspacing="0px">
            <tr class="ltr">
                <td>请输入账号</td>
                <td>
                    <input class="ipt" id="usernameInput" type="text" name="username" onblur="checkUsername()">
                    <span id="usernameMsg" class="msg"></span>
                </td>
            </tr>
            <tr class="ltr">
                <td>请输入密码</td>
                <td>
                    <input class="ipt" id="userPwdInput" type="password" name="userPwd" onblur="checkUserPwd()">
                    <span id="userPwdMsg" class="msg"></span>
                </td>
            </tr>
            <tr class="ltr">
                <td>确认密码</td>
                <td>
                    <input class="ipt" id="reUserPwdInput" type="password" onblur="checkReUserPwd()">
                    <span id="reUserPwdMsg" class="msg"></span>
                </td>
            </tr>
            <tr class="ltr">
                <td colspan="2" class="buttonContainer">
                    <input class="btn1" type="submit" value="注册">
                    <input class="btn1" type="reset" value="重置">
                    <button class="btn1"><a href="login.html">去登录</a></button>
                </td>
            </tr>
        </table>

    </form>
</body>

</html>